| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 9a: 20°F to 25°F Zone 8a: 10°F to 15°F | |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F | |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F | |
| Average First Frost Date: | Oct. 21 - Oct. 31 | |
| Average Last Frost Date: | Apr. 21 - Apr. 30 | |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate | |
| Ecoregion: | 2b - Eastern Puget Riverine Lowlands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 98290 - Snohomish, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 33 | 35 | 37 | 41 | 46 | 50 | 53 | 53 | 49 | 43 | 37 | 34 | 43 |
| Avg Max Temp (°F) | 46 | 50 | 54 | 59 | 65 | 69 | 74 | 75 | 70 | 60 | 51 | 45 | 60 |
| Avg Precip (In.) | 5.48 | 4.17 | 4.58 | 3.46 | 2.9 | 2.4 | 1.41 | 1.61 | 2.42 | 3.93 | 6.23 | 6.16 | 44.74 |